Facebook holds sway as the default social network in many parts of the world across all Internet demographics. In China, where Facebook is blocked, a handful of homegrown social networks attract segmented audiences, ranging from upmarket urban youth to university students and migrant workers.

The document does not address censorship (See China’s Internet: The Invisible Birdcage for a longer discussion of Internet controls). We all know it is there, and Sunday we got a real time look at some of the layers of control, but this powerpoint focuses on the commercial and product aspects of Weibo.

It is not fair to call Sina Weibo a Twitter clone or knockoff. It is a better designed and more stable product, and Sina’s product roadmap appears to have it heading towards a robust SNS, almost like Facebook. I hope Twitter has people dissecting Weibo, as they could learn a lot.